Engine revving on its own!

12th July 2011, 12:19

Sometimes when I'm driving along the engine will start increasing in revs without me touching anything. Usually goes up to about 2,000 rpm sits there for a few seconds then drops. Also shes quite sluggish when I first start her up.

Any advice would be awesome! =]

12th July 2011, 12:33

have your battery checked.

12th July 2011, 14:14

mine does this too, sit at traffic and it revs up

my battery is brand new and have already had it checked to be sure

12th July 2011, 15:04

mine does same, so far replaced icv & map sensor, ordered a temp sensor as it seems to get worse when the engines hot and the fan comes on for me so hopeing that works, if its not that then I don't really have a clue!

12th July 2011, 15:10

if it solves your problem with the temp sensor, let me know please ben.

its getting annoying now, especially when the driver in front thikns your revving it yourself lol

12th July 2011, 15:12

Ok will do mate, yeah I know makes you look a right idiot sometimes lol.

12th July 2011, 15:30

Yeah I feel the same, especially when your sat next to someone at the traffic lights. Probably thinking I'm a chav in a Saxo wanting to race them... quite embarrassing. I thought it was my accelerator pedal getting stuck at first.

13th July 2011, 00:05

I have had this problem, mine was crank sensor, It won't be temp sensor, If the temp sensor is still reading but is slightly out will not cause the revs to do this all it would do is over fuel the car very slightly, The problem is either of these 3 things :

Fan switch
Coil pack
Crank sensor.

As strange as it seems its been known to be the Fan switch maybe not kicking in soon enough that's why when it gets to a certain temp its acting up.

Its 100% one of those things, I have crank sensor and a coil pack here for a vtr mk2 pm me if either of you 3 is in need of either.

13th July 2011, 09:52

Thanks ChAds, are those things easy enough to replace on your own?

13th July 2011, 12:36

Quote:

Originally Posted by ChAdS

I have had this problem, mine was crank sensor, It won't be temp sensor, If the temp sensor is still reading but is slightly out will not cause the revs to do this all it would do is over fuel the car very slightly, The problem is either of these 3 things :

Fan switch
Coil pack
Crank sensor.

As strange as it seems its been known to be the Fan switch maybe not kicking in soon enough that's why when it gets to a certain temp its acting up.

Its 100% one of those things, I have crank sensor and a coil pack here for a vtr mk2 pm me if either of you 3 is in need of either.

I had this happen immediately after fitting a coil pack but has not happend since... that is probably no help to you? Could this be anything to do with something called a Stepper Motor?

13th July 2011, 12:44

My car was revving itself & hasn't done since changing the coolant temp sensor. Mines has a green plug on it, the parts guy at the main dealer kept telling me its the blue one but thats the temp gauge sender.

13th July 2011, 21:05

Same problem here too, doesn't quite kick up sometimes in the morning, how much for the coil pack Chads ?

13th July 2011, 22:35

Quote:

Originally Posted by AndyMan

Same problem here too, doesn't quite kick up sometimes in the morning, how much for the coil pack Chads ?

Hi mate, replied to your pm, that would either be crank sensor or coil pack mate, I have both could bring them with me.

25th August 2011, 15:05

Has anyone figured this out yet? Mines getting worse and have gotten to the point of throwing it in the garage. But if it's a cheap, quick fix then I'll do it myself.

25th August 2011, 15:17

Clean out the throttle body would be a good idea as the butterfly in the inlet could be sticking open, then spray a bit of carb cleaner whilst its running directly into the throttle body.

Also may be worth putting a bit of 3 in 1 oil down the throttle cable as it may not be moving freely in the outer casing thus not closing the butterfly...

25th August 2011, 15:51

mines doing the same , have a look at my thred , i have had enough now its on ebay

25th August 2011, 16:00

was the map sensor on mine, its a bit of a bitch to find out what it is though coz there are quite a few things to cause it :/

2nd October 2011, 11:22

I've just changed my engine from a vtr 8v on a 1997 car and now got a vtr 8v from a 1999 car started it up and just keeps revving upto 5000 revs and I'm confused now I've cleaned the idle control valve and carb But now I don't know what too do any idea